International Encyclopedia of Aviation War in the air : aerial wonders of our time Black wings : the American black in aviation Air forces of the world : an illustrated directory of all the world's military air powers Chronology of significant aerospace events March 1903-December 1971 sky their frontier : the Story of the World's Pioneer Airlines and Routes 1920-1940 story of aircraft : seven decades of powered flight 75 Years of Aerospace Research in the Netherlands : 1919-1994 Aviation in the modern world : the dramatic impact upon our lives of aircraft, missiles and space vehicles Diamonds in the sky : a social History of Air Travel Aviation of to-day : its history and development Winged Wonders : The Story of the Flying Wings